PHILADELPHIA (CBS) — Philadelphia police now say two men are hospitalized in critical condition, and another man — whom police are calling a “good samaritan” — is dead after an attempted grocery store robbery last night in North Philadelphia.

Their attention has now turned to the one who got away. In the surveillance video from the Sunday night robbery in Hunting Park, he is seen standing off to the side. Now, he is wanted for murder.

The crime started at 8:25pm Sunday night, when police say a masked gunman walked into La Familia Latina, a convenience store at 5th and Glenwood. Police say he pulled a gun on the store owner, and the owner pulled one back. Both men started shooting.

“Both of them are hit, both of them go down, and they drop their weapons,” said Capt. James Clark, with the Philadelphia Police Department’s homicide unit.

Owner Antonio Monegro was hit in the stomach. His brother Chino spoke with Eyewitness News.

“He is out of danger, thank God. He is in a chair and he is conscious and he is talking,” said Chino Monegro in his native Spanish.

Police say Rafael Ramos, 26, picked up the owner’s gun and ran after the gunman. But police say the other man in the store was a lookout or accomplice. They say he grabbed the second gun and chased after Ramos, shooting him twice in the back and once in the head.

“He would give the shirt off of his back for you,” said Colon, Ramos’s older sister. “If you was homeless, he would give you some food. He would buy you stuff. That’s the kind of guy he was.”

Police say the initial gunman was taken to Frankford Hospital for the gunshot wound he suffered. Police have him in custody and his driver in for questioning. That leaves detectives looking for the accomplice (below), whom they say took a life during a few chaotic minutes in Hunting Park.

(Photo from surveillance video, provided by Phila. PD)

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Police describe him as a Hispanic man, between 18 and 25 years old. In the video, he is seen wearing a blue baseball cap and a white t-shirt.